<!DOCTYPE html>
<html>
<head>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        li{
            list-style: none;
        }
        .box{
            width: 1226px;
            height: 285px;
            background-color: pink;
            margin: 0 auto;
        }
        .box li{
            width: 296px;
            height: 285px;
            float: left;
            margin-right: 14px;
            background-color: powderblue;
        }
        .box .last{
            margin-right: 0;
        }
    </style>
</head>
<body>
    <ul class="box">
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li class="last">4</li>
    </ul>
</body>
</html>